What could it be ??

[fisherman]

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Ok , I have a big problem in my tank and I need some help from you guys.

The 200g reef tank is 3-4 months old.My problem is that 2 weeks ago I had a yellow tailed damsel and had vanished.Yesterday a firefish did the same and now it only remains an Occelaris Clown fish.

The Corals are all healthy, coralline and calerpa are growing like weeds. The parameters are all fine.

I think that in the tank ,is there some kind of creature for sure ,that is killing mine fish 0ne by one...

What or who could he be ??? Maybe a big Crab??? Yes I saw 2 big crabs about 2-3inch.Could it be ???

Please I m going crazy , and really need some advice on what should I do now ???

[ReefHawk]

I've never had one myself, but they say mantis shrimp hitchike in within LR. Search for posts on them. Might give you a glue. They kill fish and feed on them.

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[Reinhold]

My guess is that the crabs, seen or unseen, have snatched the fish out of their slumber. I'd try to get the crabs out ASAP.

[fisherman]

How I m going to do to catch the crabs ?
They are always hidden..

[Iron Crab]

fisherman,
There are some traps on the market that might work. Have you tried looking for any hitchhikers after lights are out with a small flashlight. Might give you an idea of what you are dealing with. Just me but I would try to build my own trap before buying one. Maybe using a piece of PVC pipe or a clean plastic bottle add a small trap door and bait with a piece of shrimp. Keep us posted. Bill